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=item year, four digits

=item month, between 1-12

=item day, between 1-31

=back

The return value from is holiday is either a 1 or 0 indicating true of
false, indicating whether the specified date is a holiday in the given
country's national calendar.

Additional arguments are at the courtesy of the author of the using
module/class.

=head2 holidays

Should at least take one argument:

=over